Experimental investigation to optimize fuel injection strategies and compression ratio on single cylinder DI diesel engine operated with FOME biodiesel

The present experimental investigation is devoted to optimize the nozzle geometry and compression ratio on single cylinder DI diesel engine fuelled with Fish Oil Methyl Ester (FOME) biodiesel. The FOME biodiesel with 20%, 40%, 60% and 80% are blended with diesel. The experiments have been conducted at three compression ratios 16.5:1, 17.5:1 and 18.5:1 at 240 bar and 260 bar LOP (Injection Opening Pressure) with 3 holes and 4 holes fuel injectors having 0.20 mm and 0.25 mm orifice diameter respectively. And these results are compared with pure diesel. The experimental results showed that the biodiesel blends have slightly lesser brake thermal efficiency and reduced smoke emissions in contrast to pure diesel. The blend B40D60 gives better results in comparison to all other blends with respect to brake thermal efficiency (BTE) and smoke emissions at compression ratio (CR) 17.5:1 and 4 hole fuel injector having 0.25 mm diameter at 260 bar LOP. Hence this is the optimized blend operating condition for improved brake thermal efficiency (27.15%) of FOME biodiesel with reduced smoke (14.34 HSU) emissions. (C) 2020 Published by Elsevier Ltd.